Perlite 4 QT - Coarse Bagged 4 quart size. Just for the hobbyist that does not need a large 4 cu ft bag Coarse grade. Great for orchids and other potted plants Perlite helps improve drainage and aeration when mixed with potting mixes. Mix Perlite with Spagmoss Moss to create a soil-less mix. Holds moisture and nutrients, leaving more room for air in the soil Promotes faster root growth and quick anchorage for young roots